Heat styling, over-brushing, and chemical treatments can weaken your hair and increase porosity. Try the new Matrix Opti.Repair Liquid Protein System, a professional system of Shampoo, Conditioner & Porosity Spray infused with Liquid Proteins. It targets & fills gaps in high porosity cuticles to repair strength in weak, damaged hair. With no added Parabens or Silicones, Matrix Opti.Repair is safe for all hair types and chemically treated hair.